Backend Developer applicants have rated the interview process at Viessmann Group with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 66.7% positive. This is according to Glassdoor user ratings.
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2 stage interview process - HR (common questions - why you want to change the job, your English level etc.) and after this technical stage. The technical stage was a conversation with Senior developer about common backend things like communication between services, db etc. no live coding.